ECLECL (Embeddable Common Lisp) is "an effort to modernize Giuseppe Attardi's ECL (ECoLisp) environment to produce an implementation of the Common Lisp language which complies to the ANSI X3J13 definitio...

SBCLSteel Bank Common Lisp is a Common Lisp implementation based on the CMUCL sources, but it puts a greater emphasis on maintainability. Most of the SBCL code is in the public domain, the rest under a BS...